21 However, when one looks at the Sure Sale contract to which I have made reference (and in particular to the schedule which I have reproduced) it is apparent to me that the vendor's signatures on that schedule amounted to written consent to the interest of the appellant. The words "prior written consent" should, in my view, be interpreted as meaning that a vendor must in these circumstances have given written consent prior to the sale or the purchase of real estate and not after that sale or purchase has been effected. Thus, it would be no defence to a salesman or employee of an agent to say that after a sale had been effected, the vendor upon being told of the interest which the salesman or employee had in the transaction, thereupon gave a written consent to the salesman or employee having such interest. Here, the vendors on the day upon which they signed the Sure Sale contract clearly understood whatever interest it was that the appellant had in the transaction. The appellant signed "on behalf of the guarantor" and clearly represented the guarantor. It is not to the point that the appellant failed to disclose his directorship or shareholding in Sure Sale. What he did disclose was that he was acting on behalf of Sure Sale and in my view the vendors, by their signatures contained within the schedule to the Sure Sale contract, clearly consented prior to any transaction (as that word is defined in the Act) to the appellant acting in the capacity in which he did and holding whatever interest it was that he held.